Compressibility of nanofibre-grafted alumina fabric and yarns: Aligned carbon nanotube forests

Lomov, Stepan Vladimirovitch; Wicks, Sunny S.; Gorbatikh, Larissa; Verpoest, Ignace; Wardle, Brian L.

doi:10.1016/j.compscitech.2013.10.017

Cited by 21 publications

(8 citation statements)

References 27 publications

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“…Fibrous nano-additions, even in small amounts, can significantly increase the compression resistance of fabric layups. This was demonstrated for the case of carbon nanotubes (CNT) grown on fibers (woven fabrics), both for random and aligned CNT forests [21][22][23]. For the CNT load of about 10 g/m 2 per fabric layer the layup thickness increases up to 20% for a random CNT forest and up to 30% for an aligned CNT forest at the same compaction pressure.…”

Section: Introductionmentioning

confidence: 87%

Compressibility of carbon fabrics with needleless electrospun PAN nanofibrous interleaves

Lomov

Molnár²

2016

Express Polym. Lett.

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Abstract. The present paper investigates how the presence of nanofiber interleaves affects the compressibility of the layup during manufacturing of the composites and hence determining the theoretically attainable fiber volume fraction at the given processing pressure. The results show that up to the interleave areal density of 10 g/m 2 per nanofiber layer the decrease of fiber volume fraction does not exceed 3% for a laminate of carbon fiber woven fabric. Interleaves inside a fabric laminate are more compressible than a plain electrospun veil. It can be explained as the nanofibers penetrate between the carbon fibers when applying compression during composite manufacturing. It can be stated that there is a strong interference between the interleaves and the carbon reinforcement, which can lead to effective toughness improvement of the composite without significant alteration of fiber volume content.

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Section: Introductionmentioning

confidence: 87%

Compressibility of carbon fabrics with needleless electrospun PAN nanofibrous interleaves

Lomov

Molnár²

2016

Express Polym. Lett.

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“…2cm-3DW-IBCs and CNT/2cm-3DW-IBCs were used for flexural tests, and 3cm-3DW-IBCs and CNT/3cm-3DW-IBCs were for compression tests. The web thickness and flange thickness of 2cm-3DW-IBCs and 3cm-3DW-IBCs were 1.22±0.07 mm and 0.98±0.02 mm, respectively and this values were increased to 1.38±0.08 and 0.99±0.01 for CNT/2cm-3DW-IBCs and CNTs/3cm-3DW-IBCs due to swelling of fabric after CNTs growth [35]. And the fiber volume fraction was determined by weighing composites before and after infusion, and calculated as 40.6±2.2%.…”

Section: Methodsmentioning

confidence: 95%

Hierarchical CNTs Grown Multifunctional 3D Woven Composite Beams for Aerospace Applications

Turgut

Koycu

Neje

et al. 2020

AIAA Scitech 2020 Forum

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3D weaving is an innovative approach to eliminate one of the most probable failures as delamination in composites. In this study, two novel approaches of 3D weaving and growing aligned carbon nanotubes (CNTs) directly onto 3D woven fabrics for creating multifunctional properties is performed. First, 3D woven I-beam shaped fabrics were manufactured by a modified weaving loom using glass fibers and followed by growing CNTs onto these I-beams through a chemical vapor deposition (CVD). These 3D woven Ibeams were then impregnated with epoxy resin creating mechanically robust and electrically conductive structural composites without significant weight penalty. The morphological analysis revealed that vertically aligned fuzzy CNTs are successfully grown approximately at 7.5 m long onto 3D woven I-beam glass fabrics. Electrical conductivities of glass fibers were increased in six orders of magnitude after CNTs growth. A reduction in compressive strength (26%) was observed due to tensile strength reduction of glass fibers after CNTs growth; however, flexural properties were preserved.

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“…The fibers are then introduced to ethylene gas at 350 sccm for 3 mins to deposit aligned MWCNTs that are approximately 19 µm long. Additional details of MWCNT growth and composite manufacture have been discussed elsewhere [23], [25], [50], [51]. Prior to resin infusion, the fiber stack is kept at about 150 °C for approximately two hours under vacuum conditions (740 mm Hg) to remove any residual moisture content.…”

Section: Methodsmentioning

confidence: 99%

“…Both these requirements are well satisfied in the case of aluminoborosilicate fibers, which can withstand the harsh growth conditions encountered during the CVD process and support 3-D CNT growth [26]. These fibers have been previously used to understand several aspects of the hierarchical CNT composites including manufacture and processing ([23], [50]), physical properties ([21], [24], [25], and [28]), and resin infusion. Hence, despite having lower mechanical properties than commercially relevant fibers (glass and carbon), this aluminoborosilicate fiber system is useful for investigating the aging characteristics of the hierarchical CNT composites.…”

Section: Introductionmentioning

confidence: 99%

Enhanced durability of carbon nanotube grafted hierarchical ceramic microfiber-reinforced epoxy composites

Krishnamurthy

Hunston

Forster

et al. 2017

Carbon

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As carbon nanotube (CNT) infused hybrid composites are increasingly identified as next-generation aerospace materials, it is vital to evaluate their long-term structural performance under aging environments. In this work, the durability of hierarchical, aligned CNT grafted aluminoborosilicate microfiber-epoxy composites (CNT composites) are compared against baseline aluminoborosilicate composites (baseline composites), before and after immersion in water at 25 °C (hydro) and 60 °C (hydrothermal), for extended durations (90 d and 180 d). The addition of CNTs is found to reduce water diffusivities by approximately 1.5 times. The mechanical properties (bending strength and modulus) and the damage sensing capabilities (DC conductivity) of CNT composites remain intact regardless of exposure conditions. The baseline composites show significant loss of strength (44 %) after only 15 d of hydrothermal aging. This loss of mechanical strength is attributed to fiber-polymer interfacial debonding caused by accumulation of water at high temperatures. In situ acoustic and DC electrical measurements of hydrothermally aged CNT composites identify extensive stress-relieving micro-cracking and crack deflections that are absent in the aged baseline composites. These observations are supported by SEM images of the failed composite cross-sections that highlight secondary matrix toughening mechanisms in the form of CNT pullouts and fractures which enhance the service life of composites and maintain their properties under accelerated aging environments.

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Compressibility of nanofibre-grafted alumina fabric and yarns: Aligned carbon nanotube forests

Cited by 21 publications

References 27 publications

Compressibility of carbon fabrics with needleless electrospun PAN nanofibrous interleaves

Compressibility of carbon fabrics with needleless electrospun PAN nanofibrous interleaves

Hierarchical CNTs Grown Multifunctional 3D Woven Composite Beams for Aerospace Applications

Enhanced durability of carbon nanotube grafted hierarchical ceramic microfiber-reinforced epoxy composites

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